Metered spraying device for mixed liquids



R. B. SMITH March 23, 1'948.

METERED SPRAYING DEVICE FOR MIXED LIQUIDS Filed July l, 1944 2Sheets-Sheet 1 INVENTOR.'

MUM,

March 23, 1948. R. B. SMITH 2,438,462

V METERED SPRAYING DEVICE FOR MIXED LIQUIDS Filed July l, `1944 2Sheets-Shea?l 2 Patented Mar. 23, 1948 UNIT-ED ST'TES iQFFEICE METEREDSPRAYINGDEVICE role yMIXED LIQUIDS Ronald B. Smith, East Orange, N. 7^J

Application July '1, 1944, 'SerialNm J543,076

Heretofora'as I am Well aware, as set forth in v :Patent No. 2,197,730of April Vle, 1940, it .has-been proposed to provide pumping Vequipmentcapable of delivering mixed liquids and proportioning the same atselectively variant pre-determined rates, but such equipment wascomplicated to construct and manipulate besides being cumbersomeandrelatively expensive 'to manufacture. My invention, vwhile vrealizingmany, if not all of the advanta-ges of such equipment, ris free fromthose drawbacksand -withal is extremely dependable in operation, readilyportable and convenient to manipulate.

The invention is fully set forth in the following detailed descriptionand drawings forming a part thereof in which latter Figure 1 is a sideelevation of a spray gun embodying one form of the invention;

Figure 2 is a longitudinal section taken on the line 2-2 of Fig. 1;

Figure 3 is a transverse section taken on the line 3-3 of Fig. 1;

Figure 4 is a longitudinal section taken on the line 4 4 of Fig. 2; and

Figure 5 is another longitudinal section taken on the line 5--5 of Fig.2.

Referring to the drawings and the construction shown therein, thereference number I designates the housing of the spray gun, 2 the grip,3 the nozzle portion of each housing, 3 the nozzlel carried thereby and4 the fluid chamber of a fluid-drive motor which serves to drive a pairof gear pumps hereinafter described. Said motor is of well knownconstruction7 the same includingI an eccentrically mounted, cylindricalrotor element 5, having elastically mounted opposed vanes or blades 5',that is mounted on an axle 6. The latter projects through the removableplugs a-a that in turn seal the ends of said chamber fl. Gear elementsare mounted on the reduced outer ends of said axle, the same beingrigidly xed thereon by butterfly or wing nuts 8 and 8. A

-compres'sedf'air hoseor so-called air line 9 is con-- 'nected V'to--thehollowboss '9' on the rear end of said'ho'using, Y'tliefs'ame beingadapted to deliver air into the vduct l0 \whichfserves to distribute`the same 'via -the Yauxiliary ducts Il vand l2 to the said chamberlllin which'it drives the rotor and to mixing chamber of said nozzle 3.Needle valves i3 Vand M control lthe amount of air ad mitted to' thechamber "4 and the Amixing chamber b, respectively. "Two gear pumps arerespectively mountedinthe forward end of the gun, the same comprisingfluid chambers l5 and I5 in each of which arepositioned-a pair 'ofmeshing gears EES and l,'whicharelrotatably'inounted on the stubshaftsllla'nd'fllrespectively Variable gears It and S 5are -mountedrespectively on the shoul xdere'olouterends'of each-'of the axles Il,the same Abein-g fixed thereon by butterfly nuts IS and lilrespectively. Slotted fsupport arms 2li and 2s' aremount'edonthe axlev6, the said arms being respectively "interposed between the gears 'land -lfand the adjacent V'faces of said end plugs d, Retainer bolts 2-2,l22' projectcentrally through variable gearsV 23H, 23 andalsothrough theslots inthe arms 2l), 20', -the same being adapted to receive lockingwing nuts 24, 24', which serve to maintain said gears 23, 23' in anyadjusted posi-- tion on their respective support arms. Each or thelatter arms has an integral, accurate, slotted adjusting leg, asdesignated by the numerals 25 and 25', and studs 21., 21', which projectthrough the slots in said legs and are anchored in the opposite sides oithe housing and serve to maintain said support arms in any adjustedposition when the Wing nuts 28, 28 are applied thereto and screwed home.

Liquid hose lines 29 and 29' are also connected to hollow bosses on thebutt end of the gun the same serving to supply liquid under suicienthead to fill the conduits 30 and 36' and to prime the gear pump chambersI5. Needle valves 3l, 3l serve to regulate the flow of liquid to thegear pump chambers and such regulation is further controlled by aby-pass conduit 32 associated with each gear pump chamber which iscontrolled by a cock 33. Each bly-pass, while controlling di-1 rectlythe amount 'of liquid flowing to each gear pump chamber, necessarilycontrols the amount of liquid passing from its associated gear pumpchamber to the communicating conduit 34 or 34 which affordscommunication between such gear pump chamber and the nozzle of the gun.

The invention is especially suitable for use wherever the exact meteringof one or more liquids is required and is free from the annoyance 3caused by stoppage of ilow of the mixed liquids or a single liquid wheredependance is had solely upon gravity for eecting such flow or wheresuction is relied upon to eiect the same and air bubbles enter thesystem and which stoppage foften results in spoilage of important work.The :invention is Valso especially applicable for use in 'fthe sprayingof mixed liquids in those cases Where tit is essential that the same bemixed in exact proportions at the nozzle, as for example in spraying ofa silver solution and a precipitant in the jproduction of high grademirrors or reiiectors, :.since once adjusted my improved spray gun4steadily delivers the mixed solutions in metered amounts Without thepossibility of any interference of such delivery or the proportioning ofthe mixed liquids by air bubbles entering the system or by variations inilow where reliance is had upon gravity. Furthermore, the possibility ofthe nozizle becoming clogged is minimized especially since nozzleshaving relatively minute orifices such as used in the atomizer type ofvspray gun are not required in many'ofV the applications for which theinvention is adapted, though if the character of the Work requires suchsmall nozzle apertures the same may of course be employed.

Various modifications of the construction herein described may be madewithout departing from the spirit of the invention Vas embraced withinthe scope'of the appended claims.

Having thus described the invention, what claim is: Y A y 1. In a liquiddispensing device, the combination comprising a housing, a nozzle memberassociated therewith, a'plurality of gear pumps for tion comprising ahousing having a plurality of inlet conduits and a common dischargeoutlet, a fluid-drive motor, including a rotor element, said motorhaving a pair of retractible, elastically mounted blades, interposed inone of said inlet conduits, a train of at least three gears operativelyconnected to said rotor, the middle gear of said i, ried by Said housingand directly controlled by one of the said latter fluids forproportioning with respect to each other the amounts of the dilerentfluids delivered from said housing to said spray nozzle. Y,

4. In a devicefor metering liquid to be mixed the sub-combinationcomprising a fluid-drive motor having a rotor element, a, pair ofauxiliary gear pumps, and means including a separate train of variablegears interconnecting the rotor of the motor with one gear of each gearpump for metering the amounts of liquid discharged by each of said gearpumps in response to the speed of rotation of the rotor. Y y Y RONALD BSMI'II-I.

` REFERENCES CITED The following references iile of this patent:

UNITED STATES PATENTS are of record in the Mason 1 1 Aug. 29, 1944

